Causes
Exposure of the affected areas to sun and wind may precipitate an episode, as may radiculopathy of the cervical spine. However, the anatomic location of the neural injury or irritation producing this pain is controversial. Two prevailing hypotheses are proposed. The first postulates that brachioradial pruritus is caused by injury to peripheral cutaneous nerves from sunlight exposure. The second suggests that nerves are damaged at the level of the cervical spine. Attention should be given to the c5-c6 cervical spine area. A nerve entrapment could possibly be the cause in many cases. Both mechanisms appear to be active in many patients. These are speculative, and the authors believe the etiology is multifactorial.
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